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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6d89724da1e7d2e70abd60bc8fa6adf0b5619424902e4382df51bcbb7ae6db7' 
  AND token = 'tUo1sTmzi7wYd3s8YepfOzR8pkngFuQnuIc7pK0MF2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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