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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f950519ad1ed241a7769ce6c5331f030449d8f5e38a74f721939e9d4009caf33' 
  AND token = '7/D5ZiuGs1KJKm8LhbEaZ1Wbx+XhsSs+qQJqLdT/9XU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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