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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c5d47b133b17455959ff4860e186832b97383ef253f16f4e35b2aab4848f97c' 
  AND token = 'oaHzb5qVWdE5q2Wg4wAV0Tem03WEKV222+i0yfV7Gy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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