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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90b0d81af19aebc13bf1abfaa06ce11d14906d7c05ecf1ebaed11aaad6915fb3' 
  AND token = 'P6+6FPSzlWocxFBZfJb7povBSJGc89PzU5jCmOcrZXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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