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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c6df333ad0f07f97fa057b1a327c21eb4175f0f969ce09539f6c24184be2eb7' 
  AND token = 'r6JjAdGSbiqo1qBIVO/lpfifyuTMXFeY/wX0rcdwMsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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