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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3886849069fef3b6e87fceed8ce0e97840bfa46ca7f9478d94c9680be220561a' 
  AND token = 'U1gEHVti4vSxLovZBgMtlI/d71Vwdf+ahpT6eaq12g8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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