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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f22b1a54fa8d5676afde102cc8ac9169a6f94e417626da72d3380c5a5edb4d14' 
  AND token = 'W9krHvqNSeqD9B30n7u4vIwYG2Xg94c9dct4X5KpYbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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