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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7e9f989cde993126ef7ef7591d6574986827ff4e1bd04c7ad8da3ad6dc81c7a' 
  AND token = 'Ceu+9voUOgcDAxMciJCPZZOj7+2RrldluFmTPUleRLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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