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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceb8a3cbd00d88e375fe1691326853a56a4bf6d1961a5434edf16fd6647acd1b' 
  AND token = 'RBpW+D90gy0UdYWbg5IbES+AnbyE9nuPf9/NLZWWKu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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