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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '161c34c1bcd6efe3606f22fb942726d6dcbd4794b29c2f5da5d1ad8c0c3db18c' 
  AND token = '0Zvbygge/wCl7w4d0/fGRGkoDrnEJhwwI7bLU0BnGEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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