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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63ea09c40c75773a7c8b13ee3cfac8f860204f23d4db1b30baba73d4ef32180b' 
  AND token = 'mnAIS3PeL4J86PLa2N6aaOxhePCBxLWlSWGTcohBh3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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