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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dba9b514f9dd0ea71a84650ab9dd5f401d39918478b63246344e5f080d13ce2b' 
  AND token = '+mDgmyZNTC7K2yDLndTKDsf97R4MNPlkaSQjaYJyiOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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