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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e699d018fcdb021193198e5cbbc89359d3c7304d88eeaf2f1b6d21267fc71f2d' 
  AND token = 'V7TU6nLwl+jmpvb7JmFOmcmrQ3vRHe31UyOXtOhfbxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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