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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b70656b10670c9f75ffe008c021c06d3d781a655483cf0e449dd8ea8d34ddf48' 
  AND token = '60A5bGAvO6FsSnKKtOoxRwI5f9qVzpzLAkbD4zIihn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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