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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b83b2b34971c148e6e5876ebf99ff826ef8d8a8e3406b251084d070ce39aca28' 
  AND token = 'aN+r3NLQoXbXoJZ34ZbcGCkB/5PcFKWa4S9HWIM99nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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