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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4c7cef299be5d67b3bbf33c49ca855c697f9af3d91b3959239186fb4fd33b13' 
  AND token = 'xHNPHm5P7VVJnIdqTRV9F7RzPpCysTxOpYug2oweUBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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