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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec550190d56dc2f9d932b192cbfa78d2b1bd0dcc5192e1ab7aa8e0dac26f9b52' 
  AND token = 'BaXwv5z708otVfd1FKIMoRx916uSKiJXluany7he0TA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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