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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0405e63a029c09d9fe26e8d769074b626455ca299599e4a4e35d496982077cb6' 
  AND token = 'mFTwhvQMLvo21ra2I//Z1LzNwJxVU2DsJWG5Qc99CNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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