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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95c599cba815edecd577a7acb127ae8745fece7e5d932dac85ab52f0e23befe1' 
  AND token = 'meM8i+nnbjZIn1F25jsn3OTJvxjGdCt9jq00MbGgZ9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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