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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7f37b30e13e34ae63a560ba71c388ce63bd10bcf012f4f4e118ea2a049d4d40' 
  AND token = 'S52bNVZgZzG5FDfDDzJJidpPmq5bjB6fMhm4geJvmsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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