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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0a4dbfac2f39f8925f22fd0c754f0323c11a176e09ed570605d7ea66f73ec84' 
  AND token = 'veH50ffKQ0u+soJs6yzdlMO6zQVkW0xTB2W1YxXbIFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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