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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '715e9f18bd623e363142b87fa68f99dc27d7ecea2ed28c7139f24ced30bdb2f7' 
  AND token = 'Cz1HQDMpKBwLAtodCrQ4+g1qE6DLpIgbNp3J/W9WyC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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