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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e682f25aba716ad7d3c3926536c9098bb5564e827f75975d770fe3b518e40df' 
  AND token = '0a1gd7NCgRJAe2McXIoS9Q0pPxZimQOfUb54Y16N4Rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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