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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c083dcc83bc4a1b6568f1f8a69db0c9b52b1d6a8659a8c87cf8b9d22a605995' 
  AND token = 'MUSQhznSjKSb6EFP5ATtqjL7Yt4R3YglaoQYyPcgAIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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