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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46dc2aee3c3455ddec77dfe325341c1ce6ddeac8316566295b2a38f5ee6fa66b' 
  AND token = '8NL86ILZQMhnuQQS9nij9zukt7H5TaUSnVspcDUpCaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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