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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57cd30edeace90e792d4e4aaecae42ea649d2a7ca879471f7d6c1daa9f2e76ec' 
  AND token = 'WcFJfCxG48cDVTQ5gRk2aUXy3Rrde/hxlpwopGFwScc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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