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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60d16bee98505b13c270fc2044a5774cb8606ae111d4fa1ef792038f28b046b3' 
  AND token = 'TwfUJqiTAn7Ky1EwYdckg/V2zbVIj4yzmvPKCMt40d8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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