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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87e78d11ac8e3d5904179bbcbe6a9b5294ec4d89844fe42e1ff7998023762cb5' 
  AND token = 'vVfYuJAHFfJU4iarNSkuBP6qERiqYf9gDXX0xU9xaW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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