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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6ebb72aec286f193c96ee9f691bd2ba43c5fea1f8a647688d9ab89a4d4271ad' 
  AND token = '80CEfAiqVLh/Wtn1HS/AHBcS1HSEgwV12pDSuRnAUL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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