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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e28ce21e604f51318cbbec92cc654ee87a0905a3b48f62d54c85594ec603167' 
  AND token = 'o7+1dszeS+ywtRC++HeII6SrImbl7rb3kSC/9lc/or4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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