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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7eddd4830fafb3eefe66e0f1958c41c234a6a381c3b37adb0f72a64c04c1384' 
  AND token = 'MavfJBf4mHSJ69s9fA3yAmNnLag6i3FyYMJRV2Hk7yA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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