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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1361388d46d367dec8e2aa81897370b29ab794a5f5fa6b2e589081f31c53d301' 
  AND token = 'ItsPcnRk4gChTkGNW+QE6PXRSJmC6Hb1VxiFd2RKTlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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