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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25ad7e5992cc0a4f2a7b8d794689f00675c7cb915564a41241f16434db1aa744' 
  AND token = 'UMzt04nUljvgrAFy1I12KU4xfRIpLC9jaGywkkx/AeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00337

JSON explain

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