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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36defd00f92bff10d462af090f602de8d696a35c387a2c681f35d25cb1580053' 
  AND token = 'E5OMWcMCewrTITxQ0iRHhQWtO1hW6IjWO0cMMt4bJL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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