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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6395114005492342ef75ed9d9b475fb7881ab083e23abcbb5c1284c4bd7a78c6' 
  AND token = 'jcYg07YmwoUynXtGH8XzXatJ7Rw7aTsE/6xbHxlz80A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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