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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b37ba9b5a451f686e7ac52155aa97d5521383722b9459e4cb817dd4a834ad08e' 
  AND token = 'hCZ8rP1gf+AtYaKBeUiaasIvfPiux39zn3tVEgy19sM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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