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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '006092cabc70f7c159cbc7c0f5bb087b656f6bbd9800958c8c330b3db042d5d3' 
  AND token = 'nLOitCSq2o3fhrvf2v/9kYXxkQ4CgR1rnUe5nELWB7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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