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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a05cdc4445be67c0d6b5273cf570608eb9f4a369471bfb26bb57fd4f786a183' 
  AND token = 'izhEQRdW/4jE9R4KqaTmwaYkOnWTwDerS70qdrSXoMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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