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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2c268f48448e2ff0908d2fa244c9dcd21b85962813410ef7c197b6ba37f7b1a' 
  AND token = 'rImsMyT/yoYh820dkwbwCCO/puv4JbRmkaF+vOe/ZzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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