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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f232688ba69269d02fecd3bb462984aea4464f809be68f76e1b6ac8e21fdc108' 
  AND token = '0GE1I9jy1xYHuCErL5+vP4JEhYQ1Q/InmXvtkN3j58U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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