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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdf990fd2168d5a70903e39f3f9d22b93cb9b589f4eed1801d7d87ee9b6aded8' 
  AND token = 'lhPc/EEXA6fAS+MAfNJbLQ9RZZa3IBJM0+04FUHRWB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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