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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7556f981c301c05c88916b9311e85f029cef7063a29870c36a7c7ca7c61a9a21' 
  AND token = 'or7hzyBwoz2ZhnWkCgGnpZUwF+EQucSQdSZwc0cvivI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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