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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6c69039c08ac51eb91087a8acc075d513165b092eff42ad67030f7becb0181d' 
  AND token = 'd4EJBI0e+0DPG4ezWqGuNdHl1tWyno/+GfdpWxIiVRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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