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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3d68297fe3df9da91bf5318ea9a21bfa58cb3463037e6251b46b3151d0bc249' 
  AND token = 'aNSqzDfCyaXfn28d+Mt/pAJJOd1lupbMunXBwqDTUdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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