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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d0a6e738c815587b54bcbce200b77a9de48ff85f144f54e3b793bd4f7c0f091' 
  AND token = 'M53GL80AtQRWZ0OXGNzWzIJiuaojseJKYtbEP9+6VPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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