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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '701b08a4b4a491f63242339f0ed3afeb3d04d652eb1efa6b1a092cc3d975c9bf' 
  AND token = '64YY0kmfrtJyC/cAHEGA/IfwETpear3DuN19FxLqv2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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