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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e1cbc5f0aabbec953cc228677d23c59a63b342997ea3961cd7353d55a74db56' 
  AND token = '6AsSCNlxfD/PMlCAIopQuG3NqCbmPD+3tUED/I9PAug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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