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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20adbd64b61ba4e674997d92b7a7f98a776cc4d6ee5a698558acf07c1622d118' 
  AND token = '1a+XY95as/wA2JQJRBGC36wJdL4jVae/I8PLf+sRAZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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