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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f9863c33b44d8198b7973192513d08d5b1b084cbba2b72a737001c10cb47805' 
  AND token = 'OAtysqYHcpbD+7pWXjiPApC2lBbCmPbFfOnfFY1kAzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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