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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa0014980fdf505aff69e0287b678b5c443a5633c05fd2e6042a5cf11f7f3382' 
  AND token = '3JtM8f6KxuI6VZvlAyOsJsl00qE01lTcGomQ5TSxm+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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