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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e684eafe7f2b8d02c1379d94ddd058c7c2f5ff4082ce9d956aefe2955c72a1a' 
  AND token = 'zrLbqEau/yiJhkPcI1h5gZbUU/apzocUSJiU2ZL7KdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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