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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '631bf3d253fb307d48e3884687355ed2e3098e723575ba8ce1acd1bd1acbe241' 
  AND token = 'JIcz43eCv8ZDg1KY0v8psczQYLDqoaovJfqvwfG8od8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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