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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '126dc92e4923983d1a1ce5797060a1dc189ad6fc5c8f09140cff34716ac7c888' 
  AND token = 'dtr+yEd4o4ZTwfFDteeb/aHjgcy2hv6mNswipgEzKcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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