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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bae0897c4b5a19076910eb907df1688adc35652a6d49e4c60efe05fd0d0973b8' 
  AND token = 'cgHKqdzvEeY5x5mlzm9Sn7CIpf5y2DDFjy+6R+V0Etk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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