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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79bcc86b87ce08378790f5f64568fac96d10b51a8fe9b1b30089726e15def607' 
  AND token = 'F9rhBTwhzqkS0jD4dRLfFUpvM6wyBE9n+Tm4krqNh74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}