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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '799523aa6d3b8a20078a415c2c663cfc74e57becf2018201d8ed77c22e70bf7f' 
  AND token = 'plibRONznLD4QMtFt/7lsKmFRmrDUIFGhP+B89GhDwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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