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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '343c5d9013de67dd4fd7244dadfb52385050b67bd2b1637656630a2fab428c6e' 
  AND token = '/8XWfkxjxPPUIWBPbwkgP6/d02btPJPq7+bkerWUbSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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