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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7cb7bde80e663fef0ad0574aeaa96b6c68d8ad67191b39d063c4480f92ba1f6' 
  AND token = 'nSXI96Bwo93H042CNW41w+VtzaJ92PWS1oxOASm5HQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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