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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '302f6fa14e89535a4d9a625dbf9f2d473506b239ac3de7f4627d2b70a9b49de2' 
  AND token = 'y2lmup5FFQ1EbIawABtSU7+WAXggICT/RAtQf/Bt8JE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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