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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f647ca74cf1d2f40129f35da9e08b62d90cc2b43f59543c40d0be1451ecdaaa0' 
  AND token = 'q7Im+H/LWtO7YHezFklbnI0lE6la0Kpaa5X2TrDNcmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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