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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f032ac5c2d7b14224dfb1d8dbc8760ee04bf91a9b2b0e7e5fb5e9cfbfc513ce' 
  AND token = 'lFLoo7zK0YdFa5v9Zj0A4U5LCVld+PcDUfgS3AMTMTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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