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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf632947e4b4179649a1e62d6b5d2ad02f8bfce508128cf6f15097f8f9b6709f' 
  AND token = 'asm2G6Us+T10muA8J6u5kCQLxSqQ2AqkWe0B1XxhNR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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