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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f68906d5c58214a9fad7a1e3e1e23ac197aa031b2d5be5bf7760bd20e4227446' 
  AND token = 'o36xZovSDLFl02H8XnPnkjktJFSAh6lNsOFHd0qo1kY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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