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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3148338bf7bf5d24f5c96d04a70549e640aa5c16584901eb23d81d1ef327fbe' 
  AND token = '1rEpdef/q7TBqrHDf8sjUyut0KX+OFZTFoo5UJiM9dE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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