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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3f60766082bfbde4c414d7524ace006906096f2e953ea20f3ed03c645aee77b' 
  AND token = 'Ma+KJnp5An254RJN+14Tuh/dO8K34kYbYAb1DCAzhJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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