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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30a9065968039a1c7b3df21af5639603ca4ac1c45fbe2d681bcbf340b5667b21' 
  AND token = 'S5+LMU4wlP4bhtrKHH2/zn/JT7Egz1e8AHHZNXb/TrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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