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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db64b154673f4df3de698b5859e8bbb9dc02fae9c880eaf946541e1de8523f56' 
  AND token = '84FUlfvOtZGglwIAoAeIHeB79VRL/qa1hBSWBIn2DBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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