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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '683fd81387c44da1952cb4606904b6a3f5b959feac90fe16648f3fb16f6c6962' 
  AND token = 'sNEhoofZSegznoUJfe6XCKPzi/UpAfjDrb6h1PUQDvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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